steering wheel shake--please help!

[goblue]

So I recently had the winter tires swapped for my old performance tires, and the steering wheel shakes (not violently, but quite noticably) between 65 and 75 mph. Not steadily through that range, but it will shake for a few seconds, go away if I accelarate or coast a bit, and then come back a few seconds later.

It can't be the suspension or alignment, cause it was fine before. I'm guessing it's either improper balancing, air pressure, or something wrong with one of the tires.

The place I had the tires put on (and balanced) is in NJ, and I'm in ME. My dealership wants $40 just to check it out. It doesn't bother me much. I don't want to pay for balancing anyway unless this is a hazard that will make me blow a tire or will ruin my suspension or alignment.

Anyone know what this might be and what the dangers of not getting it checked out might be?

Advice would be much appreciated!
-rob

[infox]

just take it to a local les schwab/firestone etc, usually costs around $20~ to balance all 4 tires.